Lc 50

GC/MS analyses were performed on an Agilent 6890N Network Gas Chromatograph coupled to an Agilent 5973 Inert Mass Selective Detector (Agilent, Santa Clara, CA, USA) using the following GC columns: (i) a Restek Rxi-PAH, later described as 50 % diphenyl – 50 % dimethylpolysiloxane - like phase (Restek, Bellefonte, PA), 60 m length, 0.25 mm id, 0.10 μm film thickness, and maximum programmable temperature 360 °C; (ii) an Agilent DB-5 with 5 % diphenyl – 95 % dimethylpolysiloxane (Agilent, Santa Clara, CA, USA), 60 m length, 0.25 mm id, 0.25 μm film thickness, and maximum programmable temperature 350 °C; (iii) a SE-52 with 5 % diphenyl – 95 % dimethylpolysiloxane of 12 m length, 0.29 mm id, and 0.34 μm film thickness whose operating parameters are provided in reference 19 ; (iv) a J&K Scientific LC-50 column (50 % liquid crystal) with dimethylpolysiloxane stationary phase (J&K Scientific, Edwardsville, Nova Scotia, Canada), 20 m length, 0.25 mm id, 0.10 μm film thickness, and 270 °C maximum temperature; and (v), a J&K Scientific LC-50 of 15 m length whose column dimensions and operating parameters are provided in reference 17 (link).